Enhanced stability, bistability, and exceptional points in saturable active photonic couplers

Yertay Zhiyenbayev, Yannis Kominis, Constantinos Valagiannopoulos, Vassilios Kovanis, Anastasios Bountis

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


A generic photonic coupler with active and lossy parts, gain saturation, and asymmetric characteristics is examined. Saturable activity is shown to be able to enhance the overall stability of the steady states, prevent evolution to undesirable unbounded modes, and allow for bistable operation in specific regions of the parametric space. Both stability and bistability are studied in the phase space of the system, where the basins of attraction of each state are identified, providing an accurate description of the dependence of the electric fields on the initial conditions. Continuous families of exceptional points are detected via suitable regulation of the coupling and asymmetry features of the configuration. In this way, a complete description of the nonlinear dynamics landscape is provided, which should be crucial for multiple application-driven designs incorporating such a ubiquitous optical component.

Original languageEnglish
Article number043834
JournalPhysical Review A
Issue number4
Publication statusPublished - Oct 23 2019
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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